function showMenu(id) {
  if(document.getElementById(id).style.visibility == "hidden") {
    document.getElementById(id).style.position		= "static";
    document.getElementById(id).style.visibility	= "visible";
  }
  else {
    document.getElementById(id).style.visibility	= "hidden";
    document.getElementById(id).style.position		= "absolute";
    document.getElementById(id).style.left		= -100;
    document.getElementById(id).style.top		= -100;
  }

  document.getElementById('mainTable').height		= '100%';
}



function updateTime() {
  now = new Date();
  now.setTime(now.getTime());

  var hour = now.getHours();
  if(hour < 10)
    hour = "0" + hour;
  var minute = now.getMinutes();
  if(minute < 10)
    minute = "0" + minute;
  var second = now.getSeconds();
  if(second < 10)
    second = "0" + second;

  document.forms[0].elements[0].value = hour +":"+ minute +":"+ second;
}
setInterval("updateTime()",1000);